Annie Lennox has addressed questions concerning the T-shirt she wore on a recent American Idol appearance.

The singer wore a shirt emblazoned with the words 'HIV Positive' on the show last week.

The Eurythmics leader confirmed that she does not have the disease, but she wore the outfit to challenge social stigma about HIV and AIDS.

She posted on her blog: "The fact that I wore the T-shirt made thousands of people speculate whether I was HIV positive or not. So many people responded, that it was the number one most discussed topic on Yahoo and MySpace."

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She added: "The T-shirt is a bold statement of solidarity with those of us who are HIV positive. It risks social chastisement, because it is accompanied by a load of fear and taboo.

"We want HIV to go away... but it's currently the biggest killer of women of reproductive age around the globe. As a woman and a mother I intend to keep sending out the message."